Changes in Lip Length and Strain after En-masse Retraction with Maximum Anchorage in Female Patients with Bimaxillary Protrusion

Aim: The aim of the study is to evaluate the effect of en-masse retraction with maximum anchorage on the lip length, lip strain, and interlabial gap in adult female patients with bimaxillary protrusion. Materials and Methods: Thirteen patients underwent initial records including photographs, study casts, and cephalometric x-rays. En-masse retraction was performed using friction mechanics, with the use of temporary anchorage devices and power chains after the extraction of first premolars. The soft tissue was analyzed using lateral cephalometric radiographs before and after retraction. Results: The results showed that en-masse retraction had a significant effect on reducing lip strain, increasing lip length, and reducing interlabial gap. Conclusion: The findings suggest that en-masse retraction can be an effective tool in improving the soft tissue profile in patients with bimaxillary protrusion